<!--
 * @Author: WangGuojian 1085844536@qq.com
 * @Date: 2023-09-15 18:54:15
 * @LastEditTime: 2023-09-16 10:48:45
 * @LastEditors: WangGuojian 1085844536@qq.com
 * @FilePath: \htmld:\Developer\WGJ\VSCode_WorkSpace\Web\vue\vue_test\src\components\MyFooter.vue
 * @Description:
-->
<template>
    <div class="todo-footer" v-show="total">
        <label>
            <!-- <input type="checkbox" :checked="isAll" @change="checkAll"/> -->
            <input type="checkbox" v-model="isAll" />
        </label>
        <span>
            <span>已完成{{ doneTotal }}</span> / 全部{{ total }}
        </span>
        <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
    </div>
</template>

<script>
export default {
    name: 'MyFooter',
    props: ['todos', 'checkAllTodo', 'clearAllTodo'],
    computed: {
        // 总数
        total() {
            return this.todos.length;
        },
        // 已完成数
        doneTotal() {
            //此处使用reduce方法做条件统计
            return this.todos.reduce(
                (pre, todo) => pre + (todo.done ? 1 : 0),
                0
            );
        },
        // 控制全选框
        isAll: {
            //全选框是否勾选
            get() {
                return this.doneTotal === this.total && this.total > 0;
            },
            //isAll被修改时set被调用
            set(value) {
                this.checkAllTodo(value);
            },
        },
    },
    methods: {
        /* checkAll(e){
                    this.checkAllTodo(e.target.checked)
                } */
        //清空所有已完成
        clearAll() {
            this.clearAllTodo();
        },
    },
};
</script>

<style scoped>
/*footer*/
.todo-footer {
    height: 40px;
    line-height: 40px;
    padding-left: 6px;
    margin-top: 5px;
}
.todo-footer label {
    display: inline-block;
    margin-right: 20px;
    cursor: pointer;
}
.todo-footer label input {
    position: relative;
    top: -1px;
    vertical-align: middle;
    margin-right: 5px;
}
.todo-footer button {
    float: right;
    margin-top: 5px;
}
</style>
